Apparatus

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sensors Mode-S transponder

4BA999

ICAO 24-bit transponder address · allocated to Turkey

Currently assigned to TC-JLY · AIRBUS A-319

Hex
4BA999
Octal
22724631
Decimal
4,958,617
Country
TR
Tail
TC-JLY
Type
A319
No current signal · last broadcast 58m ago
Flights observed
168
Distinct callsigns
20
Country
TR
Last broadcast
58m ago

Last known position

Most recent position reported by Mode-S 4BA999.

Country allocation

The ICAO 24-bit address 4BA999 falls within the block assigned to Turkey (TR) by ICAO Annex 10, Volume III. Every aircraft registered in Turkey receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
THY8YK - 5 2026-06-22
THY8TG - 5 2026-06-22
THY6YS Turkish Airlines 5 2026-06-10
THY49F Turkish Airlines 5 2026-06-10
THY9VB Turkish Airlines 4 2026-06-23
THY7TZ - 4 2026-06-21
THY6FV - 4 2026-06-21
THY2VK Turkish Airlines 4 2026-06-10
THY1RV - 4 2026-06-23
THY94N - 3 2026-06-25
THY87R - 3 2026-05-28
THY7QW Turkish Airlines 3 2026-06-19
THY5KB Turkish Airlines 3 2026-05-28
THY3BY Turkish Airlines 3 2026-05-28
THY2TX - 3 2026-06-19
THY2CE Turkish Airlines 3 2026-06-09
THY2738 Turkish Airlines 3 2026-06-19
THY1SG - 3 2026-06-21
THY9LV Turkish Airlines 2 2026-06-09
THY96F Turkish Airlines 2 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-25 THY94N - Jun 25, 15:10 UTCJun 25, 15:40 UTC30m
2026-06-25 THY8HB KCM → IST Jun 25, 09:34 UTCJun 25, 13:14 UTC3h 40m
2026-06-25 THY8JM - Jun 25, 03:40 UTCJun 25, 07:34 UTC3h 55m
2026-06-24 THY6GT - Jun 24, 18:29 UTCJun 24, 22:10 UTC3h 40m
2026-06-24 THY3EW - Jun 24, 13:30 UTCJun 24, 16:14 UTC2h 45m
2026-06-23 THY9VB EDO → IST Jun 23, 08:39 UTCJun 23, 09:14 UTC35m
2026-06-23 THY1RV - Jun 23, 07:09 UTCJun 23, 07:45 UTC35m
2026-06-22 THY8TG - Jun 22, 15:35 UTCJun 22, 19:19 UTC3h 45m
2026-06-22 THY1CB - Jun 22, 12:19 UTCJun 22, 13:10 UTC50m
2026-06-22 THY2522 - Jun 22, 10:25 UTCJun 22, 11:09 UTC45m
2026-06-22 THY8YK - Jun 22, 05:54 UTCJun 22, 08:25 UTC2h 30m
2026-06-21 THY6FV - Jun 21, 23:24 UTCJun 22, 02:25 UTC3h 0m
2026-06-21 THY7QK HTY → IST Jun 21, 15:19 UTCJun 21, 19:09 UTC3h 50m
2026-06-21 THY7TZ - Jun 21, 11:55 UTCJun 21, 12:24 UTC30m
2026-06-21 THY1SG - Jun 21, 10:14 UTCJun 21, 10:40 UTC25m
2026-06-21 THY6FE - Jun 21, 06:50 UTCJun 21, 08:35 UTC1h 45m
2026-06-21 THY4RE - Jun 21, 03:49 UTCJun 21, 05:04 UTC1h 15m
2026-06-20 THY8TG NUE → IST Jun 20, 15:29 UTCJun 20, 18:54 UTC3h 25m
2026-06-20 THY4NZ - Jun 20, 05:29 UTCJun 20, 09:05 UTC3h 35m
2026-06-19 THY3WR - Jun 19, 19:04 UTCJun 19, 19:39 UTC35m
2026-06-19 THY2738 IST → KFS Jun 19, 16:55 UTCJun 19, 17:29 UTC35m
2026-06-19 THY7QW ZRH → IST Jun 19, 12:59 UTCJun 19, 13:44 UTC45m
2026-06-19 THY2TX - Jun 19, 11:04 UTCJun 19, 11:45 UTC40m
2026-06-19 THY4NZ - Jun 19, 05:40 UTCJun 19, 09:19 UTC3h 40m
2026-06-18 THY8NG - Jun 18, 19:55 UTCJun 18, 21:05 UTC1h 10m
2026-06-18 THY4UM - Jun 18, 17:50 UTCJun 18, 18:35 UTC45m
2026-06-18 THY2FW EDI → IST Jun 18, 10:05 UTCJun 18, 14:01 UTC3h 55m
2026-06-18 THY9VB EDO → IST Jun 18, 07:15 UTCJun 18, 07:45 UTC30m
2026-06-18 THY1RV - Jun 18, 05:40 UTCJun 18, 06:15 UTC35m
2026-06-18 THY3DG - Jun 18, 02:25 UTCJun 18, 02:40 UTC15m
2026-06-18 THY3DG - Jun 18, 01:05 UTCJun 18, 01:40 UTC35m
2026-06-17 THY3VB - Jun 17, 23:45 UTCJun 18, 00:05 UTC20m
2026-06-17 THY3VB - Jun 17, 22:30 UTCJun 17, 23:00 UTC30m
2026-06-17 THY1ED MAN → IST Jun 17, 18:20 UTCJun 17, 19:05 UTC45m
2026-06-17 THY1ZH IST → DNZ Jun 17, 16:20 UTCJun 17, 16:50 UTC30m
2026-06-17 THY3RV ATH → IST Jun 17, 13:35 UTCJun 17, 14:10 UTC35m
2026-06-17 THY3GT TLL → AYT Jun 17, 11:55 UTCJun 17, 12:15 UTC20m
2026-06-17 THY2VU MZH → IST Jun 17, 05:35 UTCJun 17, 06:35 UTC1h 0m
2026-06-17 THY6MU - Jun 17, 03:25 UTCJun 17, 04:05 UTC40m
2026-06-16 THY8SK NAV → IST Jun 16, 19:50 UTCJun 16, 20:30 UTC40m
2026-06-16 THY8JA IST → NAV Jun 16, 17:55 UTCJun 16, 18:25 UTC30m
2026-06-16 THY4MZ GZT → IST Jun 16, 12:35 UTCJun 16, 16:10 UTC3h 35m
2026-06-16 THY8NL - Jun 16, 05:30 UTCJun 16, 09:10 UTC3h 40m
2026-06-15 THY8EM SZF → IST Jun 15, 21:25 UTCJun 15, 21:40 UTC15m
2026-06-15 THY9XJ - Jun 15, 18:15 UTCJun 15, 18:45 UTC30m
2026-06-14 THY3TC IST → PRG Jun 14, 05:30 UTCJun 14, 09:20 UTC3h 50m
2026-06-13 THY6FV ASR → IST Jun 13, 18:45 UTCJun 14, 02:10 UTC7h 25m
2026-06-13 THY9DH SZF → IST Jun 13, 16:35 UTCJun 13, 16:50 UTC15m
2026-06-13 THY2QC ESB → IST Jun 13, 13:45 UTCJun 13, 14:40 UTC55m
2026-06-13 THY9VB EDO → IST Jun 13, 07:20 UTCJun 13, 07:55 UTC35m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the TC-JLY page for operator, model, and routing details .

Mode-S 4BA999 frequently asked

What is Mode-S code 4BA999?
4BA999 is an ICAO 24-bit transponder address. Allocated to Turkey. Assigned to TC-JLY.
Where is Mode-S 4BA999 registered?
Mode-S code 4BA999 is allocated to Turkey (TR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4BA999 broadcasting right now?
No active broadcast right now. Last signal was 58m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4BA999, octal 22724631, decimal 4,958,617.
What flights does 4BA999 operate?
Mode-S 4BA999 has broadcast 20 distinct callsigns, including THY8YK, THY8TG, THY6YS, THY49F, THY9VB.